Problem description: a written information about the students of class, instance attributes include: student id, name, gender, class, n course grades, requirements:
1) using the file read, create a class containing n students;
File storage format separated by Spaces such as: high class 1, 202001 bill number: 89 English: 28 computer: 77
2) n course grades use dictionary storage, support achievements recorded, modify and delete;
3) solving each student's grade average n door, and its average ranking, and according to the average scores ranking positive sequence output functions: student id, name, gender, age, n course grades, n course average, ranking,